Finding the Fourth Proportional to 1,092.38, 1,638.56 and 443.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.38 : 1,638.56 = 443.57 : x
2. Step 2: Convert to fraction form
   1,092.38/1,638.56 = 443.57/x
3. Step 3: Cross multiply
   1,092.38x = 1,638.56 × 443.57
4. Step 4: Simplify right side
   1,092.38x = 726,808.98
5. Step 5: Solve for x
   x = 726,808.98/1,092.38
6. Step 6: Final answer
   x = 665.35